Anti-globalization activists have set dozens of cars ablaze and tried to block leaders' delegations from entering the grounds of the Group of 20 summit. Police have said at least 111 officers were hurt during Thursday's clashes.

Spouses typically get together while leaders are in meetings during international summits like these. Friday's program for the spouses included a boat ride, lunch and a tour of a climate control center, the Climate Service Center. It's a think tank tasked by the German government with coming up with strategies to combat climate change.